Where could I find a book on how to do blending and digital manipulation of gigapixel images?
I'm using PTGui but I don't know how to adjust individual images so they blend in without obvious differences.
I´m quite sure that you will not find any book, but I can try to explain what I´m doing:
First thing: The shooting
Every image should have the same exposure and WB (which of course is not possible in most cases)
So, every image which is seriously over or under exposed, you have to make with exposurebracketing and blend them in PS BEFORE the stich. Don`t use HDR tecnique. This will result in unnatural colors for this image.
First step on the computer:
Open the different exposures in PS and create one image with say 4 layers ( if you took 4 exposures) and take from every layer what you need. With this way you will get one correct exposed image. Use this image for stiching.
(In my image of the churche`s dome I had to do this for 51 images)
Second step on the computer:
open and align the images in PTGui.
Still you will notice many color and exposure steps. This is a result of changing light situation during the shooting.
Now you will see that it is absolutely necessary to shoot everything in RAW files.
open the firs image with color or exposure step in PS.
Open the Raw file a second time with your raw converter with corrected exposure and WB and make the same thing as in the first step. Save it.
Now you can do the following to control what you did:
Remove the image in PTGui and then do "undo removing" at once. PTGui will reload this image but this time it is corrected and you can see if the correction you did was enough.
The same you have to do for every image with a seriosly step.
Create the image.
Adjust the image in PS and make a good finish.